When the Galactic Alliance forces arrived in the Corellian system with the intent of intimidating the Corellians through a show of firepower, Hardpoint Squadron escorted the ground-assault shuttleChandrila Skies to extract the Jedi operating on the planet. As Hardpoint Squadron approached the planet, they encountered eighteen Corellian starfighters, who headed to engage the Jedi. Without warning, the Corellian fighters broke formation and Hardpoint Squadron was assaulted by a ground-based anti-starfighter barrage. Senn and the other members of Hardpoint survived the initial attack, but the Chandrila Skies was destroyed. Despite the loss, Skywalker ordered the squadron to continue to head toward the planet to extract the Jedi with or without a shuttle. As the squadron continued through the incoming fire, Senn's snubfighter was shaken to pieces by three near hits, forcing the Rodian to eject. At the apex of the ejection, Senn disappeared into the cloud of another nearby explosion. The death of the Rodian was felt by Skywalker nearby, and Hardpoint's strength was reduced to nine. With little time to mourn Senn, Hardpoint Squadron continued with their mission and successfully extracted the other Jedi teams. The Galactic Alliance wasn't as successful, however, as Operation Roundabout turned into a disaster that triggered the Second Galactic Civil War. Senn was only of the first of many Jedi casualties in the conflict, which threatened to tear the Galactic Alliance apart.[1]

As a member of the New Jedi Order, Toile Senn was Force-sensitive. He was a capable pilot, who was selected by Grand Master Luke Skywalker to fly in his Jedi-only Hardpoint Squadron during Operation Roundabout.[1]